EspoCRM: Stored XSS via SVG attachment loading same-origin JavaScript
EspoCRM is an open source customer relationship management application. Versions 9.3.3 and below allow authenticated users to upload SVG attachments through normal attachment-capable fields and later serve those SVG files as top-level inline documents through both the attachment and image entry points, resulting in stored cross-user XSS reachable through a normal attachment workflow. Although inline SVG script is blocked by the response CSP, the same CSP still allows same-origin external script. As a result, an attacker can upload a malicious SVG together with a second attacker-controlled JavaScript attachment, then trick another user into opening the SVG to execute JavaScript in the victim's EspoCRM origin. This issue has been fixed in version 9.3.4.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-33741
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 2 Nov 2026, 22:22 UTC · Revision 1
Source evidence
EspoCRM: Stored XSS via SVG attachment loading same-origin JavaScript
core-osv · Original sourcePublished 19 May 2026, 18:14 UTC
EspoCRM is an open source customer relationship management application. Versions 9.3.3 and below allow authenticated users to upload SVG attachments through normal attachment-capable fields and later serve those SVG files as top-level inline documents through both the attachment and image entry points, resulting in stored cross-user XSS reachable through a normal attachment workflow. Although inline SVG script is blocked by the response CSP, the same CSP still allows same-origin external script. As a result, an attacker can upload a malicious SVG together with a second attacker-controlled JavaScript attachment, then trick another user into opening the SVG to execute JavaScript in the victim's EspoCRM origin. This issue has been fixed in version 9.3.4.
osv:CVE-2026-33741
Complete source record
{
"id": "276631add172ddf592df708c09a91b21e3a88e65d631cd9537d102e701a92936",
"url": "https://osv.dev/vulnerability/CVE-2026-33741",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "EspoCRM: Stored XSS via SVG attachment loading same-origin JavaScript",
"summary": "EspoCRM is an open source customer relationship management application. Versions 9.3.3 and below allow authenticated users to upload SVG attachments through normal attachment-capable fields and later serve those SVG files as top-level inline documents through both the attachment and image entry points, resulting in stored cross-user XSS reachable through a normal attachment workflow. Although inline SVG script is blocked by the response CSP, the same CSP still allows same-origin external script. As a result, an attacker can upload a malicious SVG together with a second attacker-controlled JavaScript attachment, then trick another user into opening the SVG to execute JavaScript in the victim's EspoCRM origin. This issue has been fixed in version 9.3.4.",
"evidence": "osv:CVE-2026-33741",
"products": [],
"severity": "medium",
"structured": {
"id": "CVE-2026-33741",
"aliases": [
"CVE-2026-33741",
"GHSA-5wh5-ccv2-m3pv"
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"metrics": [
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"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:L/A:L"
}
],
"affected": [
{
"ranges": [
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"repo": "https://github.com/espocrm/espocrm",
"type": "GIT",
"events": [
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"introduced": "0"
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{
"fixed": "f1763e732f34fbebf7f70f176eec1ccd8a272679"
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"source": "AFFECTED_FIELD",
"strategy": "StringRangeExpression"
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"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-33741.json"
}
}
],
"modified": "2026-10-28T02:30:23.941954813Z",
"provider": "osv",
"references": [
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33741.json",
"https://github.com/espocrm/espocrm/security/advisories/GHSA-5wh5-ccv2-m3pv",
"https://nvd.nist.gov/vuln/detail/CVE-2026-33741"
],
"provider_metadata": {
"cwe_ids": [
"CWE-79"
],
"cna_assigner": "GitHub_M",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33741.json"
}
},
"related_cves": [
{
"value": "CVE-2026-33741",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 490521,
"published_at": "2026-05-19T18:14:36.157+00:00"
}